CsharpexcelKaydetmeGizli.cs

   void excellaktar()
        {
            Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application
            {
                Visible = false
            };
            object Missing = Type.Missing;
            Workbook workbook = excel.Workbooks.Add(Missing);
            Worksheet sheet1 = (Worksheet)workbook.Sheets[1];
            int StartCol = 1;
            int StartRow = 1;
            for (int j = 0; j < dataGridView1.Columns.Count; j++)
            {
                Range myRange = (Range)sheet1.Cells[StartRow, StartCol + j];
                myRange.Value2 = dataGridView1.Columns[j].HeaderText;
            }
            StartRow++;
            for (int i = 0; i < dataGridView1.Rows.Count; i++)
            {
                for (int j = 0; j < dataGridView1.Columns.Count; j++)
                {
                    Range myRange = (Range)sheet1.Cells[StartRow + i, StartCol + j];
                    myRange.Value2 = dataGridView1[j, i].Value == null ? "" : dataGridView1[j, i].Value;
                    myRange.Select();
                }
            }

            // Dosyayı belirli bir konuma kaydet
            string dosyaYolu = System.Windows.Forms.Application.StartupPath + "\\EBSCikti.xlsx";
            workbook.SaveAs(dosyaYolu);

            workbook.Close();
            excel.Quit();
            Marshal.ReleaseComObject(sheet1);
            Marshal.ReleaseComObject(workbook);
            Marshal.ReleaseComObject(excel);
        }